rainyear/python3-in-one-pic

set is missing '!' in later part

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alok0 commented
            >>> st = set(['s', 'e', 'T'])
            >>> st
            {'s', 'T', 'e'}
            >>> st.add('t')  
            >>> st
            {'s', 'T', 't', 'e'}
            >>> st.add('t')
            >>> st
            {'s', 'T', 't', 'e'}
            >>> st.update(['!', '!'])
            >>> st
            {'s', 'T', 't', '!', 'e'}
            >>> st.discard('t') 
            >>> st
            {'s', 'T', '!', 'e'}
            >>> st.remove('T') 
            >>> st
            {'s', '!', 'e'}
            >>> st.pop()
            's'
            >>> st
            {'!', 'e'}
            >>>